The hiring of Christiane Amanpour as the new host of ABC’s “This Week” couldn’t have come at a worse time for staff morale. With ABC News reducing the payroll by 400 jobs, staffers are bitter that Amanpour, who’d been at CNN for 26 years, will make a rumored $2 million a year. An ABC spokesman refused to comment on Amanpour’s sal ary, but an insider said, “Those who know don’t talk, and those who don’t know can’t stop talking.”